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Key message Applying paclobutrazol at dormancy induction inhibited shoot apical meristem mitotic activity, thereby decreasing rate and duration of needle-primordium initiation and thus needle-primordium number in terminal buds ofPicea marianaseedlings. Abstract The effect of applying various rates of paclobutrazol (an inhibitor of gibberellic acid biosynthesis) at dormancy induction on shoot apical...